. >>> finally tonight, the nelson mandela memorial in south africa. president obama was there with former presidents clinton, bush, and carter. along with former secretary of state hillary clinton. and when the president rose to speak, what an ovation. >> president barack obama. [ cheers ] >> thank you. >> the president praised mandela's moral vision and courage. but said the great leader's work is unfinished. >> we know that like south africa, the united states had to overcome centuries of racial. it took people known and unknown to see the dawn of a new day. michelle and i are beneficiaries of that struggle. but in america and in south africa and in countries all around the globe, we cannot allow our progress to cloud the fact that our work is not yet done. and so we, too, must act on behalf of justice. we, too, must act on behalf of peace. >> mandela inspired countless people around the world including president obama who spoke from the heart in personal terms. >> it woke me up to my responsibilities to others and to myself and it sent me on an imp